Cooker.



Patented Sept. 28, 1915.

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APPLICATION FILED NOV.29, 1912.

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ATTORNEY;

wl emr UNITED sTATEs PATENT OFFICE.

ARTHUR J'. KERCI-IER, 0F BERKELEY, CALIFORNIA, ASSIGNOR TO BERKELEYELECTRIC COOKER COMPANY, OF BERKELEY, CALIEORNIA, A CORPORATIONCALIFORNIA.

COOKER.

Specification of Letters Patent.

Patented Sept. 28, 1915.

Original application led November 13, 1911, Serial No. 659,894. Dividedand this application filed November 29, 1912. Serial No. 733,983.

To all whom t may concern:

Be it known that I, ARTHUR J. KERCHER, a citizen of the United States,and a resident of Berkeley, county of Alameda, and State of California,have invented certain new and useful Improvements vin Cookers, of whichthe following is a specification.

The invention r lates to cookers generally known as fireless cookers orelectrically heated cookers, in which the food isy surrounded by a heatinsulating material so that substantially all of the heat is employed incooking the food.

This application is a division of my application Serial Number 659,894,filed inthe United States Patent Oiice on November 13, 1911.

The object of the invention is to provide a cookerhaving a metalliclining in which no thermal connection is established between the liningand the outside air, so that all of the heat is utilized in cooking. Inthe accompanying drawing I have shown the invention applied to anelectrically heated cooker, but it is evident that it canl be applied toany so-called fireless cooker.

The drawing is a vertical section ofl an electrically heated cookerprovided with the deviceof my invention. y

The cooker consists of a casing 2 of heat insulating material,preferably cylindrical in shape, and provided with a chamber thereinwhich is closed by the cover 3 which is also provided with heatinsulating material.

In the present construction the metallic lining of the chamber consistsof a double walled receptacle 4, the space between' the walls beingsealedand partly filled with water or other liquid. Arranged within thesealed chamber of the receptacle 4, in the casing, is a bucklingdiaphragm 5 which operates under variations of pressure within thechamber, caused by variations in temperature, to open and close theswitch 6 which is in circuit with the electric heating elements 7,arranged on the bottom of the receptacle 4.

The receptacle 4 is suspended within the heat insulated casing, so lthatthe switch mechanism is held above the bottom of the chamber therein bythe circular metallic ring 8, which is supported by the heat insulatingcasing. The ring 8 is provided at its lower end with an inturned flange9 and the metallic lining o'r double walled receptacle 4 is provided atits upper edge with an outturned flange 12, overlying the flange 9. The1nternal diameter of the flange 9 is greater lthan the external diameterof the metallic lining, and the external diameter of flange 12 issmaller than the internal diameter of the ring 8.

Interposed between the flanges 9 and 12 is a ring 13 of heat insulatingmaterial which spaces the flanges apart and breaks the thermalcommunication between the lining or receptacle 4 and the ring 8. Thereceptacle 4 or lining is held in place with respect to the ring 8 bymeans of bolts or screws 14 passing through the `flanges and theinsulating ring 13.

It is to be understood that the present invention is not to be limitedto an electrically heated cooker, nor to a cooker having a double-walledreceptacle which forms the lining thereof, but includes all metallicallylined cookers. This construction presents a cooker which issubstantially heat proof or heat insulated while presenting a completelymetallically lined chamber, which may be readily cleaned and washed.

I claim:

A cooker comprising a heat insulating casing having an opening at thetop, a metallic

